Improper Input Validation Affecting @openzeppelin/contracts package, versions >=4.7.0 <4.9.2
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Test your applications- Snyk ID SNYK-JS-OPENZEPPELINCONTRACTS-5711902
- published 18 Jun 2023
- disclosed 18 Jun 2023
- credit Unknown
Introduced: 18 Jun 2023
CVE-2023-34459 Open this link in a new tabHow to fix?
Upgrade @openzeppelin/contracts to version 4.9.2 or higher.
Overview
@openzeppelin/contracts is a library for contract development.
Affected versions of this package are vulnerable to Improper Input Validation when the verifyMultiProof, verifyMultiProofCalldata, procesprocessMultiProof, or processMultiProofCalldat functions are in use, it is possible to construct merkle trees that allow forging a valid multiproof for an arbitrary set of leaves. A contract may be vulnerable if it uses multiproofs for verification and the merkle tree that is processed includes a node with value 0 at depth 1 (just under the root). This could happen inadvertedly for balanced trees with 3 leaves or less, if the leaves are not hashed. This could happen deliberately if a malicious tree builder includes such a node in the tree.
A contract is not vulnerable if it uses single-leaf proving (verify, verifyCalldata, processProof, or processProofCalldata), or if it uses multiproofs with a known tree that has hashed leaves. Standard merkle trees produced or validated with the @openzeppelin/merkle-tree library are safe.